In addition, two recent studies demonstrated that DBC1 (deleted in breast cancer-1), which was initially cloned from a region (8p21) homozygously deleted in breast cancer, forms a stable complex with Sirt1 and inhibits Sirt1 activity, leading to increased levels of p53 acetylation and upregulation of p53-mediated function. This evidence concerns the gene TP53 and breast carcinoma.